MP4 Video Editor & Converter
MP4 is the dominant video container format, supported everywhere from web browsers to smartphones. FastEdit provides precise MP4 editing: trim segments, crop regions, apply blur/redact effects, adjust speed, all processed client-side through WebAssembly without uploading your video anywhere.
Need to extract a clip as a GIF, convert to WebP for a lighter animation, or re-encode with a different codec? FastEdit supports H.264, H.265, and AV1 for MP4, plus VP8, VP9, and AV1 for WebM, giving you full control over the output.
Container MPEG-4 Part 14 (.mp4, .m4v)
Video Codecs H.264/AVC, H.265/HEVC, VP9, AV1
Audio Codecs AAC, MP3, Opus (audio stripped on animated export)
Color Depth Up to 10-bit (HDR with H.265/AV1)
What it handles
- Trim and cut MP4 clips with frame-accurate precision using the visual timeline editor
- Convert MP4 to animated WebP, GIF, APNG, or WebM while controlling output quality and size
- Encode with H.264, H.265, VP9, or AV1, pick the codec that matches your platform requirements
- Blur and redact regions of video to hide sensitive information before sharing
- Apply 31 visual filter presets or timed overlays before exporting a final MP4
- Ken Burns pan-and-zoom effects for turning still photos or video into engaging animated clips
- Speed control with reverse and ping-pong modes for creative video loops
Where it fits
- Trimming screen recordings to show just the relevant segment before posting in a bug report or PR
- Converting short MP4 clips into animated WebP or GIF for embedding in documentation or chat
- Redacting sensitive information (names, emails, account numbers) from screen recordings before sharing
- Re-encoding MP4 files with H.265 or AV1 to cut file size in half for archival or bandwidth savings
- Creating social media video clips sized for specific platforms using built-in dimension presets
Technical Specifications
Container MPEG-4 Part 14 (.mp4, .m4v)
Video Codecs H.264/AVC, H.265/HEVC, VP9, AV1
Audio Codecs AAC, MP3, Opus (audio stripped on animated export)
Color Depth Up to 10-bit (HDR with H.265/AV1)
Browser Support Universal (H.264); VP9/AV1 in Chrome, Firefox, Edge
Max Resolution Up to 8K (7680x4320) depending on codec and level
Typical File Size 1-50 MB per minute depending on resolution and bitrate
MIME Type video/mp4